Reflection
One of the most important concepts in physics for games is collision response and how to react to a collision occurring. More often than not this involves one of the colliding objects bouncing off the other one. We can achieve the bounding through vector reflection. Reflection is also heavily used in many areas of game development, such as graphics programming, to find the color intensity of a fragment.
Given vector 
and normal 
, we want to find a vector that is reflected around :
The reflected vector can be found with the following formula: ...
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